A backup generator sits on a concrete pad behind a data center, silent until the grid fails. On September 16, Amazon signed a long-term supply agreement with Generac Holdings for backup power generators across its data center fleet. The SEC filing disclosed a warrant granting Amazon the right to acquire up to 1,693,745 shares of Generac common stock at $200.93 per share. Initial deliveries total $2.4 billion in 2027 and 2028. Additional purchases could reach $8 billion through September 2033.
Generac is a generator manufacturer headquartered in Waukesha, Wisconsin, with a market capitalization of roughly $11 billion. The company makes the machines that keep homes running during ice storms. In the second quarter of 2026, its net sales rose 11 percent to $1.17 billion, with commercial and industrial revenue growing 29 percent. Generac had previously disclosed a $700 million contract with an undisclosed hyperscale customer and a second hyperscale contract signed on June 24. The 8-K filing identified the second customer as Amazon.
Generac's stock surged 18 percent to $207.23 on the news, after opening up nearly 28 percent. Amazon structured the deal with performance-linked warrants: 307,954 shares vested immediately, with the remaining tranches unlocking as Amazon's cumulative generator purchases grow toward the $8 billion ceiling. The structure echoes the equity-linked supply agreements Amazon has used in logistics, most notably with Rivian for delivery vans. Applying the same financial architecture to a generator company means Amazon treats power security as a supply chain problem equal in strategic weight to last-mile delivery.
The economics justify the urgency. Unplanned data center downtime now costs an average of $9,000 per minute, according to the Uptime Institute's 2026 Annual Outage Analysis. One in five major outages exceeds $1 million in losses. Power remains the leading cause of impactful outages even as overall outage frequency declines for the fifth consecutive year. AWS operates 28 percent of the global cloud computing market. Its AI services business and its custom chip business each topped a $25 billion annualized run rate in the most recent quarter. A single prolonged outage at that scale would cost more than the initial $2.4 billion delivery contract.
Amazon raised its 2026 capital expenditure plan to $220 billion, nearly all of it for AI infrastructure. The company has said capacity will not meet demand through 2027. Data center energy consumption jumped 80 percent between 2020 and 2025, according to the International Energy Agency. Amazon has pursued primary power aggressively: an equity investment in X-energy for small modular reactors, and a $15 billion commitment to bring 2.4 gigawatts of compute capacity to northern Indiana. Those deals address the supply constraint. The Generac agreement addresses the contingency.
Generac is retooling for the demand. Management raised the company's net income margin guidance from a range of 8 to 9 percent to 9 to 10 percent and said it would invest to increase capacity for large megawatt generators. The company beat Q2 earnings estimates with adjusted EPS of $2.91 against a consensus of $1.95. A manufacturer whose products were designed to run for hours during a residential power failure is now scaling to serve facilities that cannot tolerate seconds of interruption.
The Federal Reserve raised interest rates by 25 basis points the same day Generac filed its 8-K. The cost of building $220 billion worth of data center infrastructure increased while the demand for that infrastructure did not change. When a company commits $8 billion to the system that activates only after the primary system has failed, it is telling you how close the primary system runs to its limits. The backup is where the constraint becomes visible.